What's wrong with it...if you need it.
See below.
Something to consider in regards to strike bezels (aka 'stabby bits'):
They aren't knives so they aren't likely to cause enough physiological disruption to cause incapacitation. So what you're left with is a few lacerations, which means you now have bad guy blood on your face, in your eyes, and in your mouth. Lots of risk and no real reward-- no thanks.
They can wreak havoc on your pants and coats, your car seats, and anything else you carry the light around.
They will also get flagged by TSA agents as a "weapon".